Serdang Bedagai Regency is a regency on the east coast of North Sumatra Province of Indonesia, facing Malaysia, with 95 km of coastline and covering an area of 1,904.37 square kilometres, divided into seventeen districts (kecamatan), in turn subdivided into 243 villages.

The regency surrounds the independent city of Tebing Tinggi, and also contains a district (kecamatan) by the same name (Tebing Tinggi District surrounds the city on its west side, while Tebing Syahbandar District surrounds the city on its east side).

The Serdang Bedagai Regency is divided administratively into seventeen districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census[3] and the 2020 Census,[4] together with the official estimates as at mid 2023.

[1] The table also includes the locations of the district administrative centres, the numbers of administrative villages in each district (totaling 237 rural desa and 6 urban kelurahan), and its post code.

(b) comprising four kelurahan (Batang Terap, Melati I, Simpang Tiga Pekan and Tualang) and 24 desa.